Why would 'isReady' be false?

I’m working through the tutorial.

In the process of doing so, I’ve connected my experimental frontity application to a local WordPress site. This site has a some pages, posts and a custom post type called ‘album’.

I’ve just gotten to the point in the tutorial where the ‘get’ method is introduced. So I’m playing with that in the console, using statements like:

'frontity.state.source.get('/contact/')

I’m noticing immediately that many pages I’m querying have ‘isReady’ set to ‘false’. The structure showing in the console also doesn’t seem to have any data associated with the page.

If I use get() to fetch data associated with my homepage or about page, then I get the data just fine. And in theses cases ‘isReady’ is set to ‘true’.

What is it that makes the difference?

Thanks.